TOPOGRAPHIC AND GEOLOGIC SURVEY
Jay B. Parrish, State Geologist
COMMONWEALTH OF PENNSYLVANIA
DEPARTMENT OF CONSERVATION AND NATURAL RESOURCES
M 89, Plate 31
GLASSPORT
CROP LINES AND STRUCTURE CONTOURS
EXPLANATION
CROP LINES
wb
Waynesburg coal
r
Redstone coal
p
Pittsburgh coal
Anticline
Showing axial-plane trace
and direction of plunge.
Syncline
Showing axial-plane trace
and direction of plunge.
Structure contour
Altitude of the base of the
Pittsburgh coal, in feet
above mean sea level. Contour interval 20 feet.
MAP RELIABILITY
Coal crop lines—very good
Structure contours—very good
SOURCES
Crop lines and structure contours
modified by C. H. Dodge from
Johnson, M. E. (1929), Pittsburgh
quadrangle—Geology and mineral
resources, Pennsylvania Geological
Survey, 4th ser., Atlas 27, 236 p.
Base map modified from U.S. Geological Survey
Glassport 7.5-minute topographic quadrangle map
(1960, photorevised 1979; based on aerial
photography taken in 1952, 1959, and 1977).
SCALE 1:24000
Note: The geological interpretation of coal crop
lines and structure contours shown on this map are
current to the date of compilation (1979–80, 1984).
CONTOUR INTERVAL 20 FEET
NATIONAL GEODETIC VERTICAL DATUM OF 1929
UTM PROJECTION, ZONE 17, NAD 1927
PLATE 31. COAL CROP LINES AND STRUCTURE CONTOURS OF THE
GLASSPORT QUADRANGLE, ALLEGHENY COUNTY, PENNSYLVANIA
BY
CLIFFORD H. DODGE
1985
Second edition, 2005